Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Based on:

 * include/asm-ppc/system.h

 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>

 */

#ifndef __OR32_SYSTEM_H

#define __OR32_SYSTEM_H

#include <asm/processor.h>

#include <linux/linkage.h>

/* Memory bariers */

#define barrier() __asm__ __volatile__("": : :"memory")

#define mb() barrier()

#define rmb() mb()

#define wmb() mb()

#define read_barrier_depends() do { } while(0)

#define set_mb(var, value)  do { var = value; mb(); } while (0)

#define set_wmb(var, value) do { var = value; wmb(); } while (0)

#ifdef CONFIG_SMP

#define smp_mb()        mb()

#define smp_rmb()       rmb()

#define smp_wmb()       wmb()

#define smp_read_barrier_depends()     read_barrier_depends()

#else

#define smp_mb()        barrier()

#define smp_rmb()       barrier()

#define smp_wmb()       barrier()

#define smp_read_barrier_depends()     do { } while(0)

#endif

#define nop() __asm__ __volatile__ ("l.nop"::)

#ifdef __KERNEL__

struct task_struct;

extern unsigned int rtas_data;

struct pt_regs;

extern void show_regs(struct pt_regs * regs);

extern void __save_flags(unsigned long *flags);

extern void __restore_flags(unsigned long flags);

extern void __save_and_cli(unsigned long *flags);

extern void __sti(void);

extern void __cli(void);

#define local_irq_disable()             __cli()

#define local_irq_enable()              __sti()

#define local_irq_save(flags)           __save_and_cli(&(flags))

#define local_irq_restore(flags)        __restore_flags(flags)

#define local_save_flags(flags)         __save_flags(&(flags))

#define prepare_to_switch()     do { } while(0)

#define switch_to(prev,next,last) _switch_to((prev),(next),&(last))

extern void _switch_to(struct task_struct *, struct task_struct *,

                       struct task_struct **);

struct __xchg_dummy { unsigned long a[100]; };

#define __xg(x) ((volatile struct __xchg_dummy *)(x))

#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))

#define tas(ptr) (xchg((ptr),1))

static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)

{

  unsigned long tmp, flags;

  local_irq_save(flags);

  switch (size) {

  case 1:

    __asm__ __volatile__

    ("l.lbz %0,%2\n\t"

     "l.sb %2,%1"

    : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");

    break;

  case 2:

    __asm__ __volatile__

    ("l.lhz %0,%2\n\t"

     "l.sh %2,%1"

    : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");

    break;

  case 4:

    __asm__ __volatile__

    ("l.lwz %0,%2\n\t"

     "l.sw %2,%1"

    : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)) : "memory");

    break;

  }

  local_irq_restore(flags);

  return tmp;

}

extern inline void * xchg_ptr(void * m, void * val)

{

        return (void *) __xchg((unsigned long)m, val, sizeof(unsigned long));

}

static inline void mtspr(unsigned long add, unsigned long val)

{

        __asm__ __volatile__ ("l.mtspr %0,%1,0" :: "r" (add), "r" (val));

}

static inline unsigned long mfspr(unsigned long add)

{

        unsigned long ret;

        __asm__ __volatile__ ("l.mfspr %0,%1,0" : "=r" (ret) : "r" (add));

        return ret;

}

#define irqs_disabled() ((mfspr(SPR_SR) & (SPR_SR_IEE | SPR_SR_TEE)) == 0)

#define arch_align_stack(x) (x)

/*

 * debugging aid

 */

extern void __print(const char *fmt, ...);

#endif /* __KERNEL__ */

#endif /* __OR32_SYSTEM_H */